Using the photoacoustic imaging system with a linear transducer array and in the case of incomplete projection data, the
filtered back projection (FBP) algorithm will produce many artifacts and blurs which limit the spatial resolution, degrade
the image contrast and distort the shapes of the reconstructed objects. While conventional iterative reconstruction
algorithm can reconstruct a clear image, but need much more time to compute than the FBP algorithm. In this paper, we
present an improved iterative reconstruction algorithm to reconstruct the absorbed optical deposit distribution by
combining FBP algorithm and conventional iterative reconstruction algorithm. The combined iterative reconstruction
(CIR) algorithm can produce high-quality imaging as the iterative reconstruction algorithm, and with only 20% of the
computed time used by the conventional iterative algorithm. Numerical simulation results validate this algorithm can
effectively reconstruct a clear image in a short time and in a limit field of view and suggest the improved algorithm could
be applied to fast photoacoustic imaging and noninvasive clinic diagnose.
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